Centrifugal separator



u y 351, 1934- F. M. TOMLINSON CENTRIFUGAL SEPARATOR Filed March 26,1930 r 2 Sheets-Sheet 1 IJYVENTOR. F M Tomlmsan, Y

A TTORNEYS July 31, 1934. F M. TQMLINSQN 1,968,788.

CENTRIFUGAL SEPARATOR Filed March 26, 1930 2 Sheets-Sheet 2 INVENTOR.

Fag M. Tom/imam,

A TTORNEYS 30 which engages a shoulder 21 on cup 18.

Patented July 31, 1934 'ENT OFFICE 1,968,788 CENTRIFUGAL SEPARATOR FayM. Tomlinson, Lebanon, Ind., assignor to Arthur M. Hood, Indianapolis,Ind., trustee Application March 26,

29 Claims.

The. object of my. invention. is to produce an efficientv centrifugalseparator capable of automatically separating two mixed liquids ofdifferent specific gravitiesr The accompanying drawings illustrate myin- Vention: v

Fig. 1 is an axial section of an embodiment of my invention;

Fig-2 is an enlarged fragmentaryosectional detailE through theseparation discs to illustrate diagrammatically the manner of fluidseparation; p

Fig. 3 isfla fragmentary radial. detail through the, separation discsand adjacent parts on a plane angularly displaced from the plane of Fig.1.

.Inthe drawings indicates a suitable base or pedestal to the upper endof which is secured a basin. 11 provided with a journal bearing 12 inwhich is journaled .a vertical shaft 13 driven at high speed by anysuitable driving means (not shown). The upper end of shaft 13 isslightly conified, as indicated at 14, to receive the hub 1503: acircular flange 16 which forms the bottom of the main separating bowl Bof the apparatus.

, 5 Flange 16 at its upper outer corner forms a circumferential shoulder17 for the reception of the lower end of an inverted cup 18 which, withflange 16, forms the bowl B. Below shoulder 1'7 flange 16 is providedwith a circumferentially threaded portion 19 adapted to receive aclamping nut 20 V A packing ring 22 is clamped in a pocket 23 in flange16 by the lower end of cup 18 so as to insure a fluidtight joint betweenthe parts 16 and 18. Hub 15 is tubular and opposite the upper end ofshaft 13 is pierced by a plurality of openings 25 which communicate withslots 26 formed in the subtending external surface of the hub andextending to flange 16. Arranged within the bore of hub 15 above theupper end of shaft 14 is a sleeve i 30 having slots 31 at its lower endto register with the upper ends of perforations 25, and flanking each ofthese slots is the lower end of a rib 32 projecting into the bore ofsleeve 30 and curved forwardly, in the direction of rotation, atitsupper end, as indicated at 32.

Seated on a circumferential seat 35 formed on hub 15 is the hub 36 of adisc basin comprising a bottom flange 37 and an upwardly and outwardlyflaring flange 38 which, at the junction with flange- 37 is providedwith a plurality of perforations 39. The exterior of the portion 36 ofhub 36 which lies within the height of flange 38 is provided with aplurality of verticallywxtending slots or channels 40, the purposeofwhich will appear.

1930, Serial No. 438,960

(Cl. 233r-18) Sleeved over hub portion 36' and resting upon the upperedge of flange 331s an imperforate disc 41, the main portion of which isupwardly and outwardly inclined and at its upper edge is outwardlyextended, conveniently horizontally, as indicated at 42, towards theinner wall of cup 18 to a point beyond the normal separation line, in-'dicated by the dotted line S in Fig. 1. Also sleeved over hub portion36' is a plurality of superimposed separation discs 44, the main portionof each of which is upwardly and outwardly inclined parallel with themain portion of disc 41 and each of which, at itsouter edge, isextended, as at 44. parallel with and to the extent of portion 42 ofdisc 41. The several discs 44 arespaced from each other and from disc 41by small spacing, lugs 45. Each disc 44, substantially at the junc tionbetween its main portion and its flaring pora tion 44', is perforated at46land each of these perforations is guarded, at its lower side, on theupper face of the disc, by a guard flange 4'7 which conveniently has ,aheight about one-half of the spacing between two adjacent discs 44, theseveral discs 44 being preferably so placed relative to each other thata series of perforations 46 through the several discs will be verticallyaligned. The upper edge of flange 3,8 is slotted at various points 38.to afford inlets into the disc basin immediately beneath disc 41.

To retainthe discs 41 and 44 in place there is a flange 50 carried by orassociated with a hub 51 splined at 52 to the upper .end of hub 36 andheld in place by a nut '53 threaded at 54 on hub 15 and retainingpacking gasket 55 across the upper end of the hub36 so as to seal thejoints between hubs 15, 36 and 51.

A packing ring 56, between flange 50 and the upperdisc 44 provides aseal at this point. Ex.- tending outwardly from flange 38 to a pointbeyond the separation line S and downwardly from, flange 37 toward theupper face of flange 16 are. a number of radial wings preferablycorresponding in number to the number of channels 26.

A similar series of radial wings 62 are arranged in the corner betweenhub 51 and flange 50 and extend outwardly to the upper-most disc 44preferably extendingoutwardly to near the outer parts of theperforations 46. t

Cup 18 at its upper end comprises an inwardly and upwardly extendingwall 18' which merges into an upwardly extending sleeve 185, the internal diameter of which is considerably greater than the externaldiameter of the adjacent por tion of hub 15 and sleeved within sleeve18", im-

- me r en b'bu s aced elow wall 18' is the separation cone which, at itslargest diameter fits cup 18, at several circumferentially spaced points71 and is retained therein by suitable retaining means such as springlock pins '72. The measure of the largest diameter of cone '70 issmaller than the internal diameter of cup 18 by an amount which issomewhat less than the distance between the inner diameter of cup 18 andthe separation line S.

Cone '70 at its upper end merges into a sleeve '70 which, at its upperend fits the bore of sleeve 18" at 70". Sleeve 18", below 70", and incommunication with the space between wall 18' and cone '70, isperforated at a number of circumferentially spaced points as indicatedat 75.

Arranged in the upper end of sleeve 70 by a sliding fit is a separationring which is L- shaped in cross section, the inwardly extending flange81 thereof having a desired radial dimension according to the specificgravity of the lighter liquid which is to be separated from the mixture.This ring 80 is held against upward displacement by downwardlyprojecting fingers 82 carried by a spider 83 perforated to receive theupper end of hub 15, sized to fit the bore of the upper end of hub 18with intermediate radial slots 83 and splined to said hub at 84:. Spider83 forms the upper end closure for cup 18 and nut 85, which is threadedupon the upper end of hub 15, acting against this plate, serves to holdthe bowl B firmly upon the upper end of shaft 13.

Removably sleeved upon the upper end of basin 11 is an annularcollecting pan P, the inner wall 90 of which flares upwardly andinwardly to a point close to the outer surface of hub 18 andconsiderably above the perforations '75. The outer wall 91 of pan Pflares upwardly and inwardly to a point closely adjacent the upper endof nut and above the upper end of sleeve 18" of cup 18.

Resting upon wall 91 is an inverted over-flow pan 92 which at its centersupports a supply pipe 93, the lower end of which is projected into theupper end of the bore of hub 15. A drain pipe 95 leads from the spaceunder pan 92 through walls 91 and 90.

The operation is as follows. Shaft 13 being rotated at high speed, thebowl B and the parts mounted therein, will rotate at the same speed. Aliquid mixture delivered downwardly through pipe 93 flows into the boreof hub 15, flows thence through slots 31 and perforations 25 (wings 32serving to cause the downwardly fiowing liquid to acquire thecircumferential speed of the struc ture) then downwardly throughchannels 26 into bowl B, wings 60 serving to assist the incoming liquidto acquire the circumferential speed of the bowl. At this point thecentrifugal forces serve to produce the major separation between theheavier and lighter liquids, this separation occurring at about thelocus S.

The lighter liquid, with any entrained, heavier liquid or articles flowsthence through perforations 39 and slots 38 into the interior of thedisc basin and thence upwardly through channels 40 wardly over the uppersurface of the disc to its outer edge, where it enters the stream ofheavier liquid which has been separated in the main bowl, while thelighter component passes upwardly through the perforations 46, beingprotected from. the heavier component lying upon the super-posed discsby flanges 47, and ultimately enters the space within the separatingcone 7O beneath flange 81 where it accumulates until it overflows theinner edge of said flange, passing thence upwardly out over the upperedge of hub 18" in a film which is thrown out into the annularcollecting pan P flowing thence outwardly through a suitable drainageopening P.

The heavier liquid passes up through the passages '71, thence over cone70 and out through perforations 75, striking wall of the collecting panP and dropping into basin 11 from whence it may be drained through theflange opening 11.

I claim as my invention:

1. In a centrifugal separator, a bowl, means centrally located withinsaid bowl to permit the introduction of liquid thereto adjacent the baseof said bowl, means providing a chamber concentrically arranged withinsaid bowl and formed adjacent its base with apertures providingcommunication between the interiors of said bowl and said chamber, and aplurality of axiallyspaced annular plates concentrically arranged withinsaid bowl and flaring outwardly and upwardly, said plates having theirinner peripheries disposed within said chamber and their outerperipheries disposed without said chamber but within said bowl, and theupper plates perforated near their outer edges.

2. In a centrifugal separator, an outer bowl and an inner bowl havingcommunication with said outer bowl, and a plurality of outwardly andupwardly flared axially-spaced annular plates concentrically mounted andthe upper plates perforated near the outer edges, the inner periphery ofeach of said plates being disposed within said inner bowl, and the outerperiphery of each of said plates being disposed without said inner bowlbut within said outer bowl.

3. In a centrifugal separator, an outer bowl and an inner bowl havingcommunication with said outer bowl, an outwardly and upwardly flaredimperforate annular plate having its inner periphery disposed in saidinner bowl and its outer pe riphery disposed without said inner bowl,but within said outer bowl, and a plurality of similar platesconcentrically located above said first plate, all of said plates beingslightly spaced from each other, and each of said last-named platesbeing formed with an aperture adjacent its outer edge.

4. In a centrifugal separator, an outer bowl and an inner bowl havingcommunication with said outer bowl, an outwardly and upwardly flaredimperforate annular plate having its inner periphery disposed in saidinner bowl and its outer periphery disposed without said inner bowl, butwithin said outer bowl, and a plurality of similar plates concentricallylocated above said first plate, all of said plates being slightly spacedfrom each other, and each of said last-named plates being formed with anaperture adjacent its outer edge, a portion of said aperture beingguarded by a dam.

5. In a centrifugal separator, an outer bowl and an inner bowl havingcommunication with said outer bowl, an outwardly and upwardly flaredimperforate annular plate having its inner periphery disposed in saidinner bowl and its outer periphery disposed without said inner bowl,'but within saidouteribowl, and a plurality of similar platesconcentrically located above said first plate, all of said plates beingslightly spaced from each other, and each of said last-named platesbeing formed with 'an aperture adjacent its outer edge, a portion ofsaidaperture being guardedby a dam having aheight-less than the distancebetween said plates.

6. As a new article of manufacture, an annular plate flared upwardly andoutwardly from its center, and formed with an apertureadjacent its outeredge, and a dam formed on the upper surface of said plate and guardingthe lower and lateral portions of said aperture.

- '7. In a device for effectinga two-stepseparation of liquids, a bowl,means permitting introduction of liquid axially of said bowl, means forrotating said bowl about its axis to effect an initial separation and tobuildup a wall of relatively heavy liquid at the periphery of said bowl,a second bowl co-axially mounted within said firstbowl and formed withports providing communication between the interiors of said bowls,

and means providing a plurality of outwardly "and upwardly-directedannular passages from the interior of said second bowl to the exteriorthereof, the outer ends of said passages being sealed by said wall ofheavy liquid, each of said passages communicating nearits outerperiphcry with the next upper passage.

'8. In a centrifugal separator, a bowl, means permitting axialintroduction of liquid to said bowl, said means being formed to providelarge passages communicating with said bowl, an inner bowl-coaxiallymounted within said first bowl and formed to provided for communicationthrough large passages between the interiors of said bowls, a pluralityof passages of small section permitting egress of liquid from saidsecond bowl, and means for rotating said bowls.

9. In a centrifugal separator, a bowl, means permitting axialintroduction 'of liquid to said bowl, said means being formed to providelarge passages communicating with said bowl, an inner bowl coaxiallymounted within said first bowl and formed to provide for communicationthrough large passages between the interiors of said bowls, a pluralityof passages of small section upwardly inclined in the direction ofliquid flow and permitting egress of liquid from said second bowl, andmeans for rotating said bowls.

10. In a centrifugal separator, means formed to provide a plurality ofshallow annular passages, and means for rotating said first-mentionedmeans, said first-mentioned means being outwardly flared and providedwith a series of guarded ports adjacent the outer edges of said passagesto cause the heavier portions of liquid flowing through said passagesunder the influence of centrifugal force to hug the lower walls of saidpassages, and associated flow-controlling means compelling the lighterportions to pass forwardly across the adjacent passage through saidports.

11. In a centrifugal separator, means formed to provide a plurality ofshallow annular passages flaring upwardly and outwardly from theircenters and communicating between their inner and outer ends, and meansfor rotating said first-mentioned means whereby the heavier portions ofliquid flowing through said passages under the influence of centrifugalforce are caused to hug the lower walls of said passages to' the outerannular peripheries of said passages and associated flow-controllingmeans C0111.

pelling the lighter portions to pass axially'fbrwardly to the adjacentpassage near the outer edge thereof.

12. In a centrifugal separator, a bowl, means for rotating said bowlabout its axis, means 'in said bowl for assisting the centrifugalseparation of liquids in said bowl, a separating cone mount ed adjacentthe upper end of said bowl and having an openreduced neck at its outerend, and

a ring dam mounted in said neck,said ring dam a being readily removablefrom the open end of the neck for substitution. 13. A centrifugalseparator'comprising a tubular hub formed at its lower end with anannular flange, an inverted bowl having its lower open end detachablysecured to said flange, a second bowl rotatable with said hub withinsaid first bowl and adjacent the base thereof, said hub being formedwith an axially elongated radial passage providing communication betweenthe interior or said hub and the interior of said first bowl at a pointbelow the base of said second bowl, and a separating cone co-axiallymounted in said first bowl above said second bowl and formed to permitliquid flow from the 'body of said first bowl to the space between saidcone and the upper wall of said first bowl.

14. A centrifugal separator comprising a tubu-- lar hub formed at itslower end with an annular flange, an inverted bowl having its lower openend detachably secured to said flange,'and formedat its upper end with areduced neck, a second bowl rotatable with said hub within said firstbowl and adjacent the base thereof, said hub being formed with anaxially elongated radial passage providing communication between theinterior of said hub and the interior of said first bowl at a pointbelowthe base of said second bowl, and a separating cone coaxiallymounted insaid first bowl above said second bowl, said cone being formed with anupper reduced neck received in said bowl neck, a portion-of said coneneck being snugly received in said bowl neck and a, portion thereofbeing spaced from said bowl 15. A centrifugal separator comprising atubu lar hub provided in its interior with a longitudinally-extendingblade, and formed at its lower end with an annular flange, an invertedbowl having its lower open end detachably-secured-to said flange, andformed at its upper end with a reduced neck, a second bowl rotatablewith said hub within said first bowl and adjacent the base thereof, saidhub being formed with an axially elongated radial passage providingcommuni-,

cation between the interior of said hub and the interior of said firstbowl ata point below the base of saidsecond bowl, and a separating cone.coaxially mounted in said first bowl above said tion of said cone neckbeing snuglyreceived in second bowl, said cone being formed with anupper reduced neck received in said bowl neck, a porsaid bowl neck and aportion thereof being spaced from said bowl neck to form a chambercommunicating with the space between said cone and,

the upper wall of said chamber; said lasbmentioned space being incommunication with the body of said first bowl, and saidbowl neck beingformed with an outlet, portcommunicating with said chamber.

let

-- lid 16. In a centrifugal separator, an inlet, a heavyliquid outlet, alight-liquid outlet, means interposed between said inlet and saidoutlets and forming a plurality of shallow annular passages leading fromsaid inlet toward said heavy-liquid outlet, and means for rotating saidfirst-mentioned means to effect unidirectional flow of heavy liquid andlight liquid through said passages, said first-mentioned means beingformed to deflect light liquid from said passages.

17. In a centrifugal separator, an inlet, a heavyliquid outlet, alight-liquid outlet, means interposed between said inlet and saidoutlets and forming a plurality of shallow annular passages leading fromsaid inlet toward said heavy-liquid outlet, and means for rotating saidfirst-mentioned means to effect unidirectional flow of heavy liquid andlight liquid through said passages, said first-mentioned means beingformed adjacent the outer boundaries of said passages to deflect lightliquid from said passages.

18. In a centrifugal separator, an outer bowl, a heavy-liquid outletcommunicating with said bowl, an inner bowl concentrically mountedwithin said outer bowl, means for introducing mixed liquids of differentdensities to said inner bowl, a chamber, a light-liquid outletcommunicating with said chamber, means forming a plurality of shallowannular passages from said inner bowl to said outer bowl, and means forrotating all of said elements to effect undirectional flow of lightliquid and heavy liquid through said passages, said passage-formingmeans being formed to deflect light liquid to said chamber whilepermitting heavy liquid to flow to said outer bowl.

19. In a centrifugal separator, an outer bowl, a heavy-liquid outletcommunicating with said bowl, an inner bowl concentrically mountedwithin said outer bowl, a chamber, a light-liquid outlet communicatingwith said chamber, means for introducing mixed liquids of differentdensities to said inner bowl, an outwardly and upwardly flaredimperforate annular plate having its inner periphery disposed in saidinner bowl and its outer periphery disposed without said inner bowl, butwithin said outer bowl, a plurality of similar plates concentricallypositioned above said first plate, all of said plates being slightlyspaced from each other and each of said last-mentioned plates beingformed with an aperture adjacent its outer edge, the uppermost one ofsaid plates forming the bottom wall of said chamber, and means forrotating all of said elements to effect unidirectional flow of lightliquid and heavy liquid between said plates from said inner bowl, saidplates being formed to prevent flow of heavy liquid through saidapertures, but to permit flow of light liquid therethrough to saidchamber.

20. A centrifugal separator comprising a rotary bowl having twodischarge outlets at the same end thereof, two nested dished annulardisks mounted in said bowl for rotation therewith, said disks beingflared outwardly toward both said outlets and the disk nearest said twooutlets being perforated intermediate its inner and outer peripheries,an annular separator arranged in said bowl between the perforated diskand the said outlets said separator defining two passages within thebowl one leading from the space beyond the larger radius of the disks toone of said outlets and one leading from within the larger diain etersof the disks but beyond the perforation of the perforated disk to theother of said outlets, and fluid-guide means leading into the bowl to Lthe annular mouth between the disks at the inner peripheries thereof andisolated from said lastmentioned outlet except outwardly through betweenthe disks.

21. A centrifugal separator comprising a rotary bowl having twodischarge outlets at the same end thereof, two nested dished annulardisks mounted in said bowl for rotation therewith, said disks beingflared outwardly toward both said outlets and the disk nearest said twooutlets being perforated intermediate its inner and outer peripheries,an annular separator arranged in said bowl between the perforated diskand the said outlets said separator defining two passages within thebowl one leading from the space beyond the larger radius of the disks toone of said outlets and one leading from within the larger diameters ofthe disks but beyond the perforation of the perforated disk to the otherof said outlets, and fluid-guide means leading into the bowl to theannular mouth between the disks at the inner peripheries thereof andisolated from said last-mentioned outlet except outwardly throughbetween the disks, said fluid-guide means directing fluid flow into aregion of relatively high centrifugal force intermediate bowl inlet andsaid annular mouth.

22. A centrifugal separator comprising a rotary bowl having twodischarge outlets at the same end thereof, two nested dished annulardisks mounted in said bowl for rotation therewith, said disks beingflared outwardly toward both said outlets and the disk nearest said twooutlets having an effective diameter as to a part of the flowtherebetween less than that of the other disk, an annular separatorarranged in said bowl between said disks and said outlets, saidseparator defining two passages within the bowl, one leading from thespace beyond the larger radius of the disk having the larger effectivediameter to one of said outlets and one leading from within said largerdiameter but beyond the smaller effective diameter to the other outlet,and fluid-guide means leading into the bowl to the annular mouth betweenthe disks at the inner peripheries thereof and isolated from saidlast-mentioned outlet except outwardly through between the disks.

23. A centrifugal separator comprising a rotary bowl having twodischarge outlets at the same end thereof, two nested dished annulardisks mounted in said bowl for rotation therewith, said disks beingflared outwardly toward both said outlets and the disk nearest said twooutlets having an effective diameter as to a part of the flowtherebetween less than that of the other disk, an annular separatorarranged in said bowl between said disks and said outlets, saidseparator defining two passages within the bowl, one leading from thespace beyond the larger radius of the disk having the larger effectivediameter to one of said outlets, and one leading from within said largerdiameter but beyond the smaller effective diameter to the other outlet,and fluidguide means leading into the bowl to the annular mouth betweenthe disks at the inner peripheries thereof and isolated from saidlast-mentioned outlet except outwardly through between the disks, saidfluid-guide means directing fluid flow into a region of relatively highcentrifugal force intermediate bowl inlet and said annular mouth.

24. A centrifugal separator comprising a rotary bowl having twodischarge outlets, two axiallyspaced nested dished annular disks mountedin said bowl for rotation therewith, one of said disks having aneffective diameter as to some fluid flow less than the effectivediameter of the other, an annular separator arranged within the bowl todivert discharge flow from regions of the bowl centrifugally beyond thedisk of larger effective diameter to one discharge outlet, and fromregions centrifugally within the maximum centrifugal effectiveness ofthe said last-men tioned disk to the other discharge outlet, andfluid-guide means leading into the bowl to the annular mouth between thedisks at the inner peripheries thereof and isolated from saidlastmentioned outlet except outwardly through between the disks.

25. A centrifugal separator comprising a rotary bowl having twodischarge outlets, two axiallyspaced nested dished annular disks mountedin said bowl for rotation therewith, one of said disks having aneffective diameter as to some fluid flow less than the effectivediameter of the other, an annular separator arranged within the bowl todivert discharge flow from regions of the bowl centrifugally beyond thedisk of larger effective diameter to one discharge outlet, and fromregions centrifugally within the maximum centrifugal effectiveness ofthe said last-mentioned disk to the other discharge outlet, andfluid-guide means leading into the bowl to the annular mouth between thedisks at the inner peripheries thereof and isolated from saidlast-mentioned outlet except outwardly through between the disks, saidfluid-guide means directing fluid flow into a region of relatively highcentrifugal force intermediate bowl inlet and said annular mouth.

26. A centrifugal separator comprising a rotary bowl having twodischarge outlets, two axiallyspaced nested dished annular disks mountedin said bowl for rotation therewith, the disk adjacent the concave faceof the other disk being perforated between its inner and outerperipheries, a guard around the inner portion of each perforation on theconcave face of the disk and having an axial extent less than the axialspacing of the disks, an annular separator arranged in the bowl betweenthe bowl wall and the said perforations and arranged to separate flowfrom outer regions of the bowl to the other outlet, and fluid-guidemeans leading into the bowl to the annular mouth between the disks atthe inner peripheries thereof and isolated from the lastmentioned outletexcept outwardly through between the disks.

27. A centrifugal separator comprising a rotary bowl having twodischarge outlets, two axial- 1y spaced nested dished annular disksmounted 1 in said bowl for rotation therewith, the disk adjacent theconcave face of the other disk being perforated between its inner andouter peripheries, a guard around the inner portion of each perforationon the concave face of the disk and having an axial extent less than theaxial spacing of the disks, an annular separator arranged in the bowlbetween the bowl wall and the said perforations and arranged to separateflow from outer regions of the bowl to one outlet and from inner regionsof the bowl to the other outlet, and fluid-guide means leading into thebowl to the annular mouth between the disk at 5 the inner peripheriesthereof and isolated from the last-mentioned outlet except outwardlythrough between the disks, said fluid-guide means directing fluid flowinto a region of relatively high centrifugal force intermediate bowlinlet and said annular mouth.

28. A centrifugal separator comprising a rotary bowl having a receivinginlet leading to the bottom thereof at its axis and thence radiallyoutwardly to an intermediate pressure region within the bowl and havinga discharge at its top, an annular separator disk arranged in the bowlabove the discharge end of said inlet passage, the outer periphery ofsaid disk lying in an intermediate pressure region and its innerperiphery in a pressure region of lower value than the pressure regionof the discharge end of the inlet passage, the eye of said diskaffording a fluid passage to regions of the bowl above said disk, and aplurality of annular axially-spaced stratification disks nested in thebowl above said firstmentioned disk and below the bowl-discharge outlet,each of said disks having an outer periphery in substantially the samepressure region as the outer periphery of the first-mentioned disk andhaving an eye affording a fluid-fiow passage to the bowl-region belowthe superposed disks and also perforated intermediate its radial extentto afford fluid passage therethrough upwardly toward the bowl outlet,and an annular fluid-guiding means above the upper disk directing fluidflow from the eye of the upper disk to the bowl outlet through apressure region comparable with the pressure region of the intermediateperforations of the subjacent disks. 110

29. A centrifugal separator comprising a rotary bowl having a receivinginlet leading to the bottom thereof at its axis and thence radiallyoutwardly to an intermediate pressure region within the bowl and havinga discharge outlet at its top, an annular separator disk arranged in thebowl above the discharge end of said inlet passage, the outer peripheryof said disk lying in an intermediate pressure region and its innerperiphery in a pressure region of lower value than the pressure regionof the discharge end of the inlet passage, the eye of said diskaffording a fiuid passage to regions of the bowl above said disk andsaid disk being imperforate except at its eye, and a plurality ofannular axially-spaced Stratification disks nested in the bowl abovesaid firstmentioned disk and below the bowl-discharge outlet, each ofsaid disks having an outer periphery in substantially the same pressureregion as the outer periphery of the first-mentioned disk 190 and havingan eye affording a fluid-flow passage to the bowl-region below thesuperposed disks and also perforated intermediate its radial extent toafford fluid passage therethrough upwardly toward the bowl outlet, andan annular fluidguiding means above the upper disk directing fluid flowfrom the eye of the upper disk to the bowl outlet through a pressureregion comparable with the pressure region of the intermediateperforations of the subjacent disks.

FAY M. TOMLINSON.

